Answer in brief
CVE-2026-90073 records a Unknown severity vulnerability in net/sched: hhf: clamp quantum before hhf_change() to avoid overflow. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=10239edf86f137ce4c39b62ea9575e8053c549a0 <2e0f0729f922c8de13801004e2131b57646c7c5f || >=10239edf86f137ce4c39b62ea9575e8053c549a0 <0c66223e90ddb4fd3700965a9241f2fde7bd6bc7 || >=10239edf86f137ce4c39b62ea9575e8053c549a0 <20b65bf7ca06e48ec1d62ed8012f71205328dbe4 || >=10239edf86f137ce4c39b62ea9575e8053c549a0 <dea2789a9d5ff38bdd77f2e64d550430899e2839 || >=10239edf86f137ce4c39b62ea9575e8053c549a0 <fa9c2055f0a60f801ccf286af53d387dc6202c3f || >=10239edf86f137ce4c39b62ea9575e8053c549a0 <99770b5d8e0e1c69b996f74a19d71afd2c4a9aa4 || >=10239edf86f137ce4c39b62ea9575e8053c549a0 <2446644b0f6d045b01db6acbaf55552dbec8a59a || >=10239edf86f137ce4c39b62ea9575e8053c549a0 <2164b512b97bb053e8ce4d6e95576f11bed6a005 | 2e0f0729f922c8de13801004e2131b57646c7c5f, 0c66223e90ddb4fd3700965a9241f2fde7bd6bc7, 20b65bf7ca06e48ec1d62ed8012f71205328dbe4, dea2789a9d5ff38bdd77f2e64d550430899e2839, fa9c2055f0a60f801ccf286af53d387dc6202c3f, 99770b5d8e0e1c69b996f74a19d71afd2c4a9aa4, 2446644b0f6d045b01db6acbaf55552dbec8a59a, 2164b512b97bb053e8ce4d6e95576f11bed6a005 |
| Linux/Linuxgeneric | 3.14 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In the Linux kernel, the following vulnerability has been resolved: net/sched: hhf: clamp quantum before hhf_change() to avoid overflow hhf_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) with no overflow check. A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes weight * quantum overflow the signed deficit in hhf_dequeue(), spinning forever. Clamp q->quantum before hhf_change() so both the opt and !opt paths see a sane quantum. Without this, bare "tc qdisc add ... hhf" succeeds with a clamped quantum but "tc qdisc add ... hhf limit 1000" (any option present) fails with -EINVAL because hhf_change() re-validates the unclamped default (sch_hhf.c:559). 256 matches fq_codel's floor and is a sane minimum for a DRR quantum. Conditions to recreate the bug: a device whose MTU (plus hard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy device with max_mtu == 0 accepting MTU 2147483634). Requires CAP_NET_ADMIN in a user namespace.
Quoted source text, attributed separately from HOL analysis.